Inventors say Hydra offers clean water, hope for villages

The hose took brownish water from the scummy Schuylkill River in Philadelphia to a strange apparatus on the bank -- a trailer with a solar panel, a hydrogen tank, and other odd parts with flashing digital readouts.

New technique produces highly selective filter materials

Researchers have devised a way of making tiny holes of controllable size in sheets of graphene, a development that could lead to ultrathin filters for improved desalination or water purification.

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